It kinda sucks because it's a D3.1 device and those are not that cheap (yet).
You can always sell it and recover some of the "damage".
I've been happy and content with Arris surfboard(s) currently using an SB8200 with Two 1-Gigabit Ethernet ports and an R9000 with LAG (Link aggregation).
See if your ISP supports Arris. I never had any issues with it (them) in the past 7 years.